Service manual

The E/W-Correction
A line, written at the upper- or lower side of the screen, will be larger at the screen
center when a fixed deflection current is used. Therefore, the amplitude of the deflection
current must be increased when the spot approaches the screen center. This is called
East/West correction.
The EW-DRIVE signal is generated in the HOP and will drive FET TS7480 via TS7481
and optocoupler TS7482. TS7480 will charge capacitor C2423 more or less, increasing
the deflection current when reaching the center of the screen.
Secondary Line-Voltages
During the blocking time of TS7421, the magnetic energy of coil 1 - 5 of the LOT will be
transferred to electrical energy in the secondary winding. Via rectifying and smoothing,
the several secondary supply voltages will be generated:
• EHT, Focus and Vg2-voltage,
• +180V for the CRT panel (pin 8 LOT),
• +11D for the line deflection (pin 12 LOT),
• +13VLOT for the frame deflection (pin 6 LOT),
• -15VLOT for the frame deflection (pin 3 LOT),
• Filament voltage (pin 9 LOT).
The EHT-INFO signal is derived via R3450//R3451. This signal decreases while the
beam current increases. It is fed to the HOP to compensate for loss of picture width and
picture height.